Ah I've got 'Red Orchestra' I got it for 7.99 on D-Day over a year ago, you want to spend a quick twenty minutes it's fun. It's about the eastern front during WWII, and you get to play a full range of maps. Unfortunately the map building process is too far beyond my understanding so I can't build any maps inspired by Close Combat III. What I really like about it is that you can't hit squat if you don't know how to use the sights on a firearm. It's fun explaining sight pictures to newbs on a Mosin Nagant as a German Panzer is trying to lob HE on your trench position. The game is fairly realistic with small arms but when a 1941 T-34 with a 7.62mm cannon is taking out a Tiger with one round and the Tiger's 8 mm is taking three shots to take out a T-34 there are issues, granted there are weak points to master and I'm not up for that. I like taking C-4 charges and running them up behind tanks after sneaking past enemy lines, tossing them on the back of the tank and hauling tail.
There is no jumping or running like an Olympic athlete. Your MG will overheat and you have to replace the barrel. SMGs aren't worth squat for accuracy on FA when you are holding the trigger down(try explaining burst fire to newbs). The sniper rifles requires some understanding of rifle handling. If you have a mic you can talk to other players and sometimes coordinate a strategy. But it is annoying as heck when the players carrying MGs don't understand the concept of suppressive fire, especially when you have to charge across an open field to take out enemy bunkers. You do get to call in artillery strikes if you have certain roles. There are no panzer-shreks unfortunately but there are panzerfausts, and it is plenty fun to take out two tank back to back when you sneak up behind them.
My favorite small arms in the game, are STG44(SA fire is accurate at medium range and recoil is light enough to allow easy follow-up shots), PPSH43(seems to handle much better than the PPSH41), DP28(an MG that handles like a rifle, the MG34 has SA fire which is a benefit but the DP just handles better for me), and scoped SVT40(get yourself in a nice fixed position and pick off the enemy from a distance, just fill up the sights with the guys chest). And I love running C-4 charges into enemy lines and hauling tale back after I toss it into a nest of soldiers. The overall small arms handling is amongst the most realistic in my opinion, you need to bring up the sights, line them up, and there is little such thing as shooting on the move. You can rest your gun on surfaces to improve accuracy. And there is up to 56 players on some maps. The game just needs Panzershreks for the Germans, the grenade the Germans had as an anti-tank weapon where they tied a bunch of grenades together, Bazooks for the Russians, flamethrowers for both sides(was a big weapon on the eastern fron), and of course (molotov cocktails).